Tubing check valve



Feb. 24, 1931. A. B. vo'N LINDE TUBING CHECK VALVE Filed oct. 1, 1927 47M w 75mm/V 40 complishedf weight of the. column of oil will not be sus-Y tained by the valveon the plungeigthus en- Patented Feb. 24, 1931 f-UNITEDSTATES mm 1 ALBERTJB.' rinvii, onv'roRRAivcE,cALiroa-nia- TUBING CHECK-VALVE l Appucatien-Yled october 1,1927. serial No. 223,337. f

rIAhis yinvention relates to improvements inf i 15 variably present with the oil, collects within the barrel between the standing valve of-the 'pump andthe valve ronthe plunger. :A gas In'ay bereadily compressed as distinguished from a liquid which is relatively incompress- "20fible', and consequently, when a'large quan- ',tity of gascollects between the standing valve and the plunger valve, the gas is merely cornpressed on the downward stroke of the plunger. .Frequently,:an insufficient pressureis developed upon the gas to lift the plungerfvalve i against the weightg'of the column ,of fluid within the tubing. When Vsuch condition occurs, the plunger merelyfreciprocates inv thefbarrel, compressing .the-.gas uponjthe ydownward stroke of the plunger and then allowing itto expand upon the upwardstroke of the plunger.L No` oil, or very littlefoilis' pumped, but the column of oil within the tubing is raised Aand lowered upon the up 'and down strokes ofthe plunger. This raising and lowering of the column ,of oil .con-

"sumes a considerable, amount of, power and places a considerable strain on the sucker rod resulting in Yno" useful work beingac- It is therefore anl obliect of this invention to provide a valvevin the tubing abovevtheV barrel which ywill support the columnrfof oilf inthe tubing'upon the downward strokeof the Ysucker rod and plunger, so ,that the abling the valve to openV even thoughrrgas should collect between the plunger valve and ...50 the standing valve.

'the check valve and the tubingsothatwhen Y a second collar 12 which is connected to a spe- It isanother yobject of the invention to pro-v vide an improved lcheck valve adapted tobe mounted in the tubing above the barrel, which prevents sandvwhich is frequently Vpumped with the oil, from settling on the plunger 55 valve and standing valve.` Because of the great pressures developed by the long column Y of'oil within the tubing, sand which is present in the fluid will quickly cut the 'hardest Y of steels when there is leakagek between steel fao surfaces. lThe improved checkvvalve is VdesignedV to prevent thesand fromsettling onV the plunger valve and standing valve lso as to insure 'properraction of these valves andV prevent their beingput out ofcvcommission or havingtheirveiiiciency reduced.: A .i Y `Another object. of the inventioniisto proa vide a check valve in a 'tubing above the pump` barrel which may be `removedfrom 1, the tubing on pulling the pumpplunger.Y i further object of the 'invention is` to pro,-V vide a check valve in a tubing above the pump barrel which is vsoconstructed, that 'a maxiv mum space or passageis provided between Athe check valve is open, oil or other liquidV l may flow through the check: valvefwitlrav minimum amount of resistance. f

Y `With the foregoing and otherobjectsin y -vieW,`which will be made manii'estin the Aol- 80 lowing Y detailedl description` and speciiically pointed out in the-appended clainis,`refereuce is had to the acompanying,drawings-for an illustrative embodimentA of theinvention,Y wherein: t' I" 1 l .l

Figurepl is a vertical sectionY througlra tubing and pump barrel"illustrating the improved check `valve iin vapplied" position l' therein.' ,n i v Fig-2 is a vertical section'throughtheim? provedicheck valve `illustrating ,thev sucker `rod as extendingtherethrough.ftv w f 1 Referring to ithe-eaecompanying' drawin wherein' similar ureiference characters .desigg nate'similar parts throughout, the tubing'is indicated at vTfcn the lgwerxeng' of ,whCl-l'. there isa collar C whichlis threadedly corineted t0 a 'Ripple Yl0 frhavmga vtapered Seat e 11. Y On thelower end of the nipplelOtherei/sl.

oo j

cial nipple 13, sometimes called a lift nipple, substitute nipple, or swedge The lower end of the swedge 13 is connected by means of `13 is such thatthe nipple 10 having the Atapered seat 11, will be immediately above ,the

plunger valve 22 when the plunger is in its uppermost position or at the tqp of its'stroke. The internal diameterof the' nipple *1 0 [at Y the base of thetapered seatll'is such that the plunger P and the standing valve k2O can be pulled therethrough. A:j V

The invention consists of a Vbody 2 5 having a downwardly tapered exterior surface 26 adapted to seat upon thetapered seat l10n the nipple 10. Threadedlymounted on top of Vthe body 25l is a cage 2T which holds 'a valve seat 28 against the top of the body.

AThe 'valve closure is indicated at 2,'9'and-is in the form of a dise adapted to seat upon the val-ve seat 28. The closure 29 has acentrfal aperture 3()Y therethrough to receive the sucker rod S, and afbushing 31 is threadedly mounted upon the' valve ,closure and extends up,- wardlythrough the top of 'the' cage 2f? and through the tubular extension 32ormed thereon. The iirst section of sucker` rod above the plungerispolished andthe 'bushing 31 which is preferablyjfor'med of brass, has

a close sliding -fit'with the sucker'rod; lOn

the upper end of the Vbushing 31' there vis threaded a thimble 33 serving tocompres's packing 34 about the sucker rod to prevent leakage between the'sucker rod and the bushing 3 1.` The bod-y 25 is so constructed that when it is seated onlthevtapered'seat 11 on:

the nipple 10, the top surface of the valve seat 28 is substantially flush vwith the top surface ot the nipple 10. As clearly `shown upon Figure 1 the vcollar C holds the tubing T andthe nipple 10 in spaced relation, and the lports 34 formed inthe cage-27 are ar ranged directly opposite the exposed interior surface of the collar.

1 The operation of the improved valve'is as follows:

' Upon the upward stroke of the plunger l?, theliquid or oil within the barrel above the plunger valve will be lifted upwardly, cansing the closureV 29 to be liftedsoiin o i' Vits .seat 2 8. The liquid then passes between 'the elo sure 29 kand the seat 28, flowing outwardly through the ports 34, passing upwardly against the interior surfaceofthe collar C.

It then passes upwardly through the tubing T. At the same time, anew charge of oil will be drawn into the vbarrel 16 past the standing valve 20. On the downward stro-ke of the sucker rod, as soon as the sucker rod starts its downward movement, the closure 2 9V willbe carried slowly toward the seat 28 because ofthe-ffriotional engagement between the sleeve or bushing 31 andthe sucker rod. As the downward movement of the sucker `jrod at t l 1 e ,beginning o fiits downward stroke is quite slow, the closure 29 will be gradually seated, thus eliminating hammering to a great extent. As soon as the closure 29 is seated, it supports the column of oil within .the .tubing l', if there 4is noL leakage between the s leeveor bushing 3 1 and sucker rod., the'oontnued downward nio-vement oil? the plunger I mayform partial vacuum in the space betweenthe plunger valve 22 and.

Vnoninn will .not be proelneed,`bnt ,the preek! Sure on top of Athe plnngervalve ,22 will beso reduced ,that ontlley .downward Stroke Aof the Plnne'enony .ses `within the barrel between the plunger' telt-e '2.2 .andthe Ystartling valvev 20'w`ll rees by the vp'liniaer vali/e122 wlienfonly f n. Very Slight pressureie developed Ynrlon it yln this mannen,l it will be appreoatetl that after the eolninn of oil has vbeen lifted within tbe tnbng T, it .is Pret/rented from following- 'tbe plunger 'downward upon its downward Stroke bythe Closure 2,9-, 'regardless ofthe quantityof gas which may collect within the barrel 1 5 and cause delayed opening ,of the plunger valve. Consequently, as the column; oil. cannot follow the plungerdownward uponitsdownward stroke, it is never necessary to relift the column of oil. Furthermore, the weight ofthe column of oil within the tubing T which would etherwis'e be sustained vby the sucker rod S yon its .downward stroke or 'by the v standing valve 20, Yis sustained bythe closure v29. "The ports 34 are'fpreferably arranged opposite the exposed .interior surface .ofthe collar as, ,previously explained.

This collarY basa' greater internal diameter than-that of the tubing T, a`nd,sma'll increases in diameter' affect greatly the l magnitude ,of the crosssectional area. f Consequently, by 'having the ports 34 oppositeitheexposed terior surface `of the collar, this additional spiace providedbythe slight increase in 'di-V ameter -is ltaken advantage of. In well pumps'employing a. sucker rod, the valve- 29 inusthave'the'sucker rod extending through it and the VOil must iiow past Athe valve between the sucker'rod land the tubing. By the above describedv arrangement, a Vmaximi'im space Vbetween the edge of theclosure 29 and the interior of the tubing is established, The

Vto operate the pump.

From the above described construction itwill vbe appreciated that a novel, simple and durable check valvefor tubings is provided, which is eiiicient in operation and which can not easily get out of order. Furthermore, the valve is of such'construction that oil passing the valve will not be forced through a convstricted passage which would retard it. It

will also be understood that the valve in no -way hinders theV pulling of the pump plunger, and when the pump plunger is pulled, the valve will be pulled with it, permitting easy inspection and repair if such is necessary. The. improved valvek also serves to prevent sand from settling on the plunger valve andV standing valve, andtakes the pressurev offer vthese valves on the downward stroke, reducing any cutting action by the sand under thehigh pressure vif there should be any leakage in the standing valveV or plunger valve.

Various changes maybe made in the de- V tails of construction without departing from the spirit or scope` of the invention as defined by the appended claims.

I claim: y 1. In a pumping appara-tus for wells,fa tubing, a barrel, a plunger reciprocable in by a plurality of spacedarms extending upwardly from the body, saidarms supporting at their upper ends an upwardlly extending tubular extension, and a sleeve secured to the closure and extending upwardly there.` 1'0 from, said `sleeve `slidablyY extending upwardly through the tubular extension and y being adapted to have a sucker rodextended therethrough'.

5. A-pump tube ycheck valve comprisingv a tubular body, there beingavalve seatupon the body, a valve closurel adapted to ,seatH upon said. seat, a cage for .maintaining the closure adjacent the seat, there beingan aper- 'l ture in the closure` through rwhich a suckerv S6 l rod may extend, a'sleeve secured to the closure and extending upwardly therefrom adapted Y to slidably fit about the sucker rod, said cage havingV a tubular extension slidably fitting about the sleeve, the sleeve projecting above Y the tubular extension, ay thimble threaded onto the upper end of the sleeve, and packing within the thimble adapted to be compressed Y thereby against the sucker rod. ,A In testimony whereof I'havef signed my nameto this specilication. l ALBERT 4Bg voN LINDE.

the barrel, a nipple having a seat connected to the upper end of the barrel, aV collar connecting the nipple to the tubing and having its interior inwardly expose-d. and a down-- wardly closing check valve seated upon the nipple immediately below the collar.

2. In a pumping apparatus for wells, a

tubing, a barrel, a plunger reciprocable in the barrehpa nipple connected to the upper end of the barrel having its interior inwardly exposed, a collar connecting th-e nipple to the tubing, and adownwardly closing check valve mounted upon the nipple. l 3. In a tubing through which a sucker rod extends, a nipple', a collar connecting the nipple tothe tubing, the adjacent ends of the tubing and nipplebeing spaced, and a downwardly closing check valve mounted upon the nipple through which the sucker rod extends,

* the seat for the check valve being located having an aperture therethrough through Y which a suckerrod may extend,a cage formed approximately even withV the upper endof theY nipple as and for the purpose described;

4. A tubing check valve comprisingl a tubular body having a. seat thereon, a closure` Y adapted to seat upon the' seat, said closureV 

